WO2018080043A1 - Batterie rechargeable et dispositif de prédiction de durée de vie associé - Google Patents
Batterie rechargeable et dispositif de prédiction de durée de vie associé Download PDFInfo
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- WO2018080043A1 WO2018080043A1 PCT/KR2017/010882 KR2017010882W WO2018080043A1 WO 2018080043 A1 WO2018080043 A1 WO 2018080043A1 KR 2017010882 W KR2017010882 W KR 2017010882W WO 2018080043 A1 WO2018080043 A1 WO 2018080043A1
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- electrode
- case
- impedance
- secondary battery
- reference position
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a secondary battery and an apparatus for predicting life of the secondary battery, and more particularly, to a secondary battery including a plurality of reference electrodes positioned at different distances from an electrode tab, and an apparatus for predicting the life of the secondary battery. It is about.
- водородн ⁇ е ⁇ е ⁇ ество Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.
- the SOH of the secondary battery is information indicating how much more the secondary battery can be used in the future.
- the user may display the secondary battery as a ratio of the current remaining life to the life at the time of shipment of the secondary battery. You are guided to.
- the impedance of the secondary battery gradually increases as the secondary battery degrades.
- the impedance of the secondary battery is a value reflecting the internal ohmic resistance (hereinafter, referred to as an 'AC resistance') of the secondary battery, and is one of the main parameters affecting the SOH.
- Korean Patent Publication No. 10-2014-0131079 (published date: November 12, 2014), which is a first patent document
- Korean Patent Publication No. 10-2015 which is a second patent document -0025932 (published: March 11, 2015) has been disclosed.
- the first patent document is for reducing the impedance measurement error of the secondary battery
- the second patent document is for estimating the life of the battery even while the battery is being charged.
- the present invention has been made to solve the above problems, a secondary battery and a lifespan including the secondary battery configured to consider the change in impedance reflecting the deviation of the degeneration rate according to the distance from the electrode tab of the secondary battery in the life prediction It is an object to provide a prediction device.
- the life prediction apparatus is a device for predicting the life of a secondary battery including an electrode assembly, a positive electrode tab, a negative electrode tab, a case, and a plurality of reference electrodes.
- the life prediction apparatus includes: an electrode selector configured to select the specified reference electrodes at least once every predetermined period in response to an electrode selection signal specifying at least two of the plurality of reference electrodes; In the state in which one of the plurality of reference electrodes is selected by the electrode selector, based on an alternating voltage between any one of the positive electrode tab and the negative electrode tab for the alternating current of a predetermined frequency band and the selected reference electrode An impedance measuring unit measuring an impedance associated with the selected reference electrode; And transmitting the electrode selection signal to the electrode selection unit, and predicting the remaining life of the secondary battery based on the measured impedance when the measurement of the impedance associated with each of the designated reference electrodes is completed by the impedance measuring unit. It comprises a control unit configured.
- the plurality of reference electrodes may include: a first reference electrode having one end of the two ends disposed in the case connected to a first reference position of the separator, and the other end protruding out of the case; And a second reference electrode having one end disposed in the case at both ends thereof connected to a second reference position of the separator different from the first reference position, and the other end protruding out of the case.
- the impedance measurer may measure a first impedance associated with the first reference electrode when the first reference electrode is selected by the electrode selector and select the second reference electrode by the electrode selector.
- the second impedance associated with the second reference electrode may be measured.
- the controller may estimate the remaining life of the secondary battery based on the first impedance and the second impedance.
- the distance from the first connection position where the positive electrode tab contacts the positive plate to the first reference position may be shorter than the distance from the first connection position to the second reference position.
- the controller may estimate the remaining life of the secondary battery based on the ratio of the first impedance to the second impedance.
- the plurality of reference electrodes may further include a third reference electrode configured to have one end of the two ends disposed in the case connected to a third reference position of the separator and the other end to protrude out of the case.
- the distance from the first connection position to the third reference position is longer than the distance from the first connection position to the first reference position, and the distance from the first connection position to the second reference position. Can be shorter.
- the controller may transmit an electrode selection signal specifying the selection of the third reference electrode to the electrode selection unit.
- the battery pack according to another aspect of the present invention may include the life prediction device.
- a secondary battery includes: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator positioned between the positive electrode plate and the negative electrode plate; A case configured to receive the electrode assembly; A positive electrode tab, one end of which is connected to the positive plate in the case and the other end of which is protruded out of the case; A negative electrode tab, one end of which is connected to the negative electrode plate in the case and the other end of which is protruded out of the case; And a plurality of reference electrodes configured to be spaced apart from the positive electrode tab and the negative electrode tab. Each said reference electrode is comprised so that one end may be connected to the said separator in the said case, and the other end may protrude outside the said case.
- the case is formed in a region extending in a first direction of the outer periphery of the case, at least a portion of the first sealing up and down contact with a portion between one end and the other end of the positive electrode tab or the negative electrode tab part; And an area extending in a second direction different from the first direction of the outer periphery of the case, wherein at least a part of the area is vertically disposed at a portion between one end and the other end of at least one of the plurality of reference electrodes. It may include; a second sealing portion in contact with.
- the plurality of reference electrodes may include: a first reference electrode having one end of the two ends disposed in the case connected to a first reference position of the separator; And a second reference electrode having one end disposed in the case at both ends thereof connected to a second reference position of the separator different from the first reference position.
- the distance from the first connection position where the positive electrode tab contacts the positive plate to the first reference position may be different from the distance from the first connection position to the second reference position.
- the plurality of reference electrodes may further include a third reference electrode having one end of the two ends disposed in the case connected to a third reference position of the separator.
- the distance from the first connection position to the third reference position may be different from the distance from the first connection position to the first reference position and the second reference position.
- a plurality of electrodes disposed at different distances from at least one of the positive electrode tab and the negative electrode tab so as to detect a change in the region-specific impedance of the secondary battery due to heat generated in the electrode tab.
- a secondary battery having reference electrodes can be provided.
- the plurality of reference electrodes disposed at different distances from the electrode tab by detecting the impedance to the parts of the different range of the secondary battery, It is possible to provide a life prediction device for more accurately predicting the remaining life of the.
- FIG. 1 is an exploded perspective view schematically illustrating a structure of a rechargeable battery including two reference electrodes according to an exemplary embodiment of the present invention.
- FIG. 2 is a perspective view of the secondary battery illustrated in FIG. 1.
- FIGS. 3 and 4 are views for explaining the difference in the degree of degeneration of each of the secondary batteries by the heat generation of the electrode tab of the secondary battery shown in FIGS. 1 and 2.
- FIG. 5 is a perspective view schematically illustrating a structure of a rechargeable battery including three reference electrodes according to another exemplary embodiment of the present invention.
- FIG. 6 is a block diagram schematically illustrating a functional configuration of an apparatus for predicting life of a secondary battery according to an embodiment of the present invention.
- FIG. 7 is an impedance spectrum measured by the life prediction apparatus shown in FIG. 6.
- control unit> means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.
- FIG. 1 is an exploded perspective view schematically illustrating a structure of a rechargeable battery 100 including two reference electrodes according to an embodiment of the present invention
- FIG. 2 is a combined perspective view of the rechargeable battery 100 illustrated in FIG. 1. .
- the secondary battery 100 includes an electrode assembly 110, a case 120, an electrode tab 130, a first reference electrode 141, and a second reference electrode 142. do.
- the electrode assembly 110 includes one or more positive plate, one or more negative plate, and one or more separators.
- Each positive electrode plate and each negative electrode plate included in the electrode assembly 110 may be configured to have a separator disposed therebetween. That is, the separator may be located between the positive electrode plate and the negative electrode plate.
- the separator may be manufactured in the form of a film, and repeatedly folded in a predetermined shape (eg, zig-zag) to separate each positive electrode plate included in the electrode assembly 110 from each negative electrode plate.
- the electrode assembly 110 may include a plurality of separators that are separated and disposed one by one between the positive and negative electrode plates sequentially stacked.
- the electrode assembly 110 may be accommodated in the case 120 in a state in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked with each other, or may be accommodated in the case 120 in which one positive electrode plate and a negative electrode plate are wound. .
- the positive electrode plate and the negative electrode plate may be collectively referred to as an 'electrode plate'.
- Each electrode plate included in the electrode assembly 110 is formed as a structure in which an active material slurry is applied to a current collector, and the slurry is typically formed by stirring a granular active material, an auxiliary conductor, a binder, and a plasticizer in a state where a solvent is added. Can be.
- the at least one positive electrode plate and the at least one negative electrode plate may have non-coating portions N1 and N2, which are areas in which slurry is not applied, and the non-coating portions N1 and N2 protrude from the remaining areas of the positive electrode plate and the negative electrode plate, It may be configured to contact the electrode tab 130 to be described later.
- the case 120 has a concave inner space, and accommodates the electrode assembly 110 and the electrolyte in the inner space.
- the case 120 may include an outer insulating layer and an inner adhesive layer of a polymer material, and a metal layer interposed between the outer insulating layer and the inner adhesive layer.
- aluminum may be used as the material of the metal layer of the case 120, but the present invention is not limited thereto.
- the case 120 may include an upper pouch 121 and a lower pouch 122.
- the internal space in which the electrode assembly 110 may be accommodated is formed in both the upper pouch 121 and the lower pouch 122, as shown in FIGS. 1 and 2, or the upper pouch 121 and the lower portion. Only one of the pouch 122 may be formed.
- the upper pouch 121 and the lower pouch 122 are illustrated to be in contact with each other through a sealing part in a completely separated state, but the scope of the present invention is not limited thereto.
- the upper pouch 121 is manufactured while being connected to the lower pouch 122 through at least one corner, and then joins portions corresponding to the remaining corners to abut each other, thereby sealing the electrode assembly 110 from the outside. It may be configured to.
- the edge region and the lower pouch 122 formed along the outer periphery of the upper pouch 121 may be bonded to each other (eg, by thermal fusion) such that the inner adhesive layers located in the form facing each other may seal the inner space.
- each of the positive electrode plate and the negative electrode plate are formed to protrude from the electrode assembly 110 toward the sealing portion of the case 120 as compared with the remaining areas, and the positive electrode tab 131 and the negative electrode tab ( 132 may be connected.
- the electrode tab 130 collectively refers to the positive electrode tab 131 and the negative electrode tab 132, and is a component that electrically connects the secondary battery 100 to another external battery 100 or another device.
- the plurality of secondary batteries 100 constituting the battery pack may be electrically connected to each other through a bus bar.
- the electrode tab 130 may be configured to directly contact the bus bar.
- the electrode tab 130 since the electrode tab 130 is a component for electrical connection between the inside and the outside of the secondary battery 100, at least a part thereof may be made of an electrically conductive material such as a metal.
- Each of the positive electrode tab 131 and the negative electrode tab 132 is provided to extend from the inner side of the case 120 to the outer side of the case 120, and at least a portion of the positive electrode tab 131 and the negative electrode tab 132 may be interposed between the sealing portions of the case 120. .
- the positive electrode tab 131 is configured such that one end is connected to the positive electrode plate in the case 120 and the other end protrudes out of the case 120.
- one end of the negative electrode tab 132 is connected to the negative electrode plate in the case 120, and the other end thereof is configured to protrude out of the case 120.
- Each of the uncoated portion N1 of the positive electrode plate and the uncoated portion N2 of the negative electrode plate may be mechanically connected and fixed to one end of each of the positive electrode tab 131 and the negative electrode tab 132 by welding or the like.
- a point P1 (hereinafter referred to as a “first connection point”) where the non-coating portion N1 of the positive electrode plate and the positive electrode tab 131 contact each other, and a point where the non-coating portion N2 and the negative electrode tab 132 of the negative electrode plate contact each other
- P2 (hereinafter, referred to as a “second connection point”)
- heat generated from the first connection point P1 and the second connection point P2 is spread to other regions of the secondary battery 100, and thus the first connection point P1 and / or the second connection point P2. In the area closer to), the deterioration progresses faster and the impedance increases.
- the reference electrodes 141 and 142 are configured to be spaced apart from the positive electrode tab 131 and the negative electrode tab 132. Specifically, each of the reference electrodes 141 and 142 may have one end connected to the separator of the electrode assembly 110 in the case 120, and the other end may protrude out of the case 120.
- one end of the reference electrodes 141 and 142 may be inserted between any one separator and any one positive electrode plate in the case 120.
- one end of the reference electrodes 141 and 142 may be inserted between any one separator and any one negative electrode plate in the case 120.
- the separator to which any one of the plurality of reference electrodes is connected may be different from the separator to which at least one of the remaining reference electrodes is fed.
- the plurality of reference electrodes may be commonly connected to the same separator.
- the separator may have a folding or stacking structure along a z-axis direction corresponding to the thickness of the electrode assembly 110, and a plurality of reference electrodes including the first and second reference electrodes 141 and 142 may be z-axis coordinates.
- the lifetime prediction apparatus 200 which will be described later will describe impedances reflecting the deviation of the degeneration rate in the z-axis direction of the electrode assembly 110 due to the heat generated from the electrode tab 130. It is possible to measure using.
- one end of the first reference electrode 141 is connected to the first reference position M1 of one of the separators, and one end of the second reference electrode 142 is the second reference of the same separator. Assume that it is connected to the position M2.
- the y-axis coordinate value of the first reference position M1 is the y-axis of the second reference position M2 based on either one of the first connection position P1 and the second connection position P2. It may be smaller than the coordinate value. In this case, the linear distance from the first connection position P1 to the second reference position M2 is shorter than the linear distance from the first connection position P1 to the first reference position M1.
- Each reference electrode 141 or 142 may include at least a conductive wire (eg, a copper wire).
- portions except for a predetermined region from one end of each of the reference electrodes 141 and 142 and a predetermined region from the other end may be coated by an insulating material (eg, enamel).
- one end of each reference electrode not coated with an insulating material may be coated by a non-aqueous slurry containing LTO (lithium titanium compound).
- the non-aqueous slurry coating one end of each reference electrode may be a mixture of LTO, conductive material and binder in a predetermined ratio. Accordingly, when the respective reference electrodes 141 and 142 are connected to the separator of the electrode assembly 110, the risk of short circuit can be reduced.
- a plurality of sealing parts S1 to S4 provided in a form connected to each other along the outer circumference thereof may be formed.
- the case 120 is along the first sealing portion S1 and the second direction (eg, the direction of the y-axis) formed in an area extending along the first direction (eg, the direction of the x-axis) of the outer circumference. It may include a second sealing portion (S2) formed in the extending area.
- the x-axis corresponds to the direction in which the width of the secondary battery 100 extends
- the y-axis corresponds to the direction in which the length of the secondary battery 100 extends
- the z-axis corresponds to the direction in which the thickness of the secondary battery 100 extends.
- it may be a direction perpendicular to each other.
- At least a portion of the first sealing portion S1 is in contact with a portion between one end and the other end of the positive electrode tab 131 and / or the negative electrode tab 132 up and down.
- the first sealing part S1 is formed at any one corner at which the other ends of the positive electrode tab 131 and / or the negative electrode tab 132 protrude from four corners of the rectangle. Can be formed.
- the second sealing part S2 is in contact with a portion between one end and the other end of at least one of the first reference electrode 141 and the second reference electrode 142.
- 2 illustrates that the other ends of the first reference electrode 141 and the second reference electrode 142 protrude outwards through the second sealing part S2, but the present invention is not limited thereto.
- the sealing part may further include a third sealing part S3 and a fourth sealing part S4.
- the third sealing part S3 may be formed on the opposite side to the first sealing part S1 based on the second sealing part S2.
- the fourth sealing part S4 may be formed on the opposite side to the third sealing part S3 based on the first sealing part S1. It will be apparent to those skilled in the art that any one of the widths W1 to W4 of the plurality of sealing parts S1 to S4 may be the same as or different from the other.
- a portion between one end and the other end of at least one of the first reference electrode 141 and the second reference electrode 142 may be the third sealing portion S3 or the fourth sealing portion S4 instead of the second sealing portion S2. It can be sealed up and down by). That is, if the distance from the first connection point P1 and / or the second connection point P2 to the first reference electrode 141 and the second reference electrode 142 can be different from each other, the first reference electrode 141 ) And the second reference electrode 142 may be freely changed.
- 3 and 4 are views for explaining the difference in the degree of degradation of each of the secondary battery 100 by the heat generation of the electrode tab 130 of the secondary battery 100 shown in FIG.
- 'O' corresponds to the first connection point P1
- 'X1' corresponds to the first reference position M1
- 'X2' corresponds to the second reference position M2.
- the BOL state refers to the beginning of life when the cycle count of the secondary battery 100 is less than a predetermined value.
- the resistivity at the first reference position M1 may be only a negligible difference from the resistivity at the second reference position M2.
- the resistivity at the distance X1 corresponding to the first reference position M1 may be significantly greater than the resistivity at the distance X2 corresponding to the second reference position M2. . That is, an increase amount of the specific resistance at the first reference position M1 relatively close to the first connection point P1 among the first reference position M1 and the second reference position M2 is increased by the first connection point P1. It can be confirmed that it is larger than the increase of the specific resistance at the second reference position M2 which is relatively far from.
- FIG. 5 is a perspective view schematically illustrating a structure of a rechargeable battery 100 including three reference electrodes according to another exemplary embodiment of the present invention.
- the third reference electrode 143 is configured to be spaced apart from the positive electrode tab 131 and the negative electrode tab 132.
- one end of the third reference electrode 143 may be connected to the separator of the electrode assembly 110 in the case 120, and the other end may be configured to protrude out of the case 120.
- one end of the third reference electrode 143 may be commonly connected to a separator connected to one end of the first reference electrode 141 and the second reference electrode 142. In this case, one end of the third reference electrodes 143 may be inserted between any one separator and any one positive electrode plate in the case 120. Alternatively, one end of the third reference electrodes 143 may be inserted between any one separator and any one negative electrode plate in the case 120.
- the third reference position M3, which is a position where one end of the third reference electrode 143 is in contact with the separator, may be different from the first reference electrode 141 and the second reference position M2.
- one end of the third reference electrode 143 may be connected to a separator different from the separator connected to one end of the first reference electrode 141 and the second reference electrode 142.
- the distance from the first connection position P1 to the third reference position M3 is longer than the distance from the first connection point P1 to the first reference position M1, and the first connection point P1. ) May be shorter than the distance from the second reference position M2. That is, the third reference position M3 may be a specific portion between the first reference position M1 and the second reference position M2. For example, when the other ends of each of the first to third reference electrodes 143 protrude to the outside through the second sealing part S2, the third reference electrode 143 is the first reference electrode 141 and the second.
- the first reference electrode 141 and the second reference electrode 142 may be parallel to each other between the reference electrodes 142.
- the secondary battery 100 may further include additional reference electrodes in addition to the first to third reference electrodes 141, 142, and 143.
- FIG. 6 is a block diagram schematically illustrating a functional configuration of an apparatus 200 for predicting life of a secondary battery 100 according to an exemplary embodiment of the present invention
- FIG. 7 is illustrated by the apparatus 200 for predicting life of FIG. 6.
- the life prediction apparatus 200 may include an electrode selector 210, an impedance measurer 220, and a controller 230.
- the secondary battery 100 may be included in the life prediction apparatus 200.
- the life prediction apparatus 200 may further include an information guide unit configured to output the life of the secondary battery 100 predicted by the controller 230 to the user as a visual and / or audio signal.
- the life prediction apparatus 200 may be included in the battery pack 300 together with at least one secondary battery 100.
- the battery pack may be included in a power system 400 such as an electric vehicle or an energy storage device.
- the electrode selector 210 is configured to select at least one of the reference electrodes in response to the electrode select signal transmitted from the controller 230.
- the electrode selection signal is a signal that designates one or two or more of the plurality of reference electrodes included in the secondary battery.
- the electrode selection signal may be a signal that simultaneously designates the selection order and / or time interval between the selection time points for two or more designated reference electrodes.
- the electrode selector 110 may select at least one or more reference electrodes specified by the electrode selection signal most recently transmitted from the controller 230 at predetermined intervals.
- the electrode selector 210 may include at least one switching element.
- the electrode selector 210 may include a multiplexer.
- the impedance measuring unit 220 is configured to measure the impedance between any one of the positive electrode tab 131 and the negative electrode tab 132 (hereinafter referred to as 'reference tab') and the reference electrode selected by the electrode selector 210. do.
- the impedance measuring unit 220 measures the first impedance associated with the first reference electrode 141 in a state where the first reference electrode 141 is selected by the electrode selecting unit 210, and then the electrode thereafter.
- the second impedance associated with the second reference electrode 142 may be measured while the second reference electrode 142 is selected by the selector 210.
- the impedance measuring unit 220 may form a current path electrically connecting the reference tab and the selected reference electrode.
- the impedance measuring unit 220 applies the alternating current of a predetermined frequency band (for example, 300 kHz to 0.1 Hz) to the reference tap while the one of the reference electrodes is selected by the electrode selector 210, thereby providing the reference tap. And the impedance spectrum between the selected reference electrode can be measured.
- a predetermined frequency band for example, 300 kHz to 0.1 Hz
- the impedance measurer 220 may apply an alternating current of a predetermined frequency band to the reference tap while any one of the plurality of reference electrodes is selected by the electrode selector 210. As a response to this alternating current, an alternating voltage may be applied between the reference tab and the selected reference electrode.
- the impedance measuring unit 220 may measure the AC voltage and measure an impedance (or impedance spectrum) related to the selected reference electrode based on the measured AC voltage and the AC current.
- the impedance measuring unit 220 may be connected to the positive electrode tab 131 and the negative electrode tab 132 based on the signal transmitted from the controller 230. Similar to the above-described method, by applying an alternating current and measuring the alternating voltage of the positive electrode tab 131 and the negative electrode tab 132, the overall impedance of the secondary battery 100 may be measured.
- the controller 230 may be implemented in hardware such as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and microprocessors ( microprocessors) and electrical units for performing other functions.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- microprocessors microprocessors
- the controller 230 transmits an electrode selection signal to at least one of the plurality of reference electrodes to the electrode selector 210 at predetermined intervals.
- the controller 230 may output an electrode selection signal according to a predetermined rule. For example, the controller 230 may select one of a plurality of reference electrodes at predetermined time intervals, a selection order between two or more selected reference electrodes, and a time interval between selection time points through the electrode selection signal. ) Can be notified.
- the electrode selection signal output from the controller 230 may vary according to the state of the secondary battery.
- the controller 230 may output the electrode selection signal after a predetermined time from the time when the charging and discharging of the secondary battery 100 ends. This is to prevent a problem that the measurement accuracy of the impedance is lowered due to the temperature temporarily raised by the charging and discharging of the secondary battery 100.
- the controller 230 is connected to the first connection point P1 among the plurality of reference electrodes. Only an electrode selection signal for commanding selection of the closest first reference electrode 141 may be periodically output. That is, when the first impedance between the first connection point P1 and the first reference electrode 141 is less than the first reference value, selection of the remaining reference electrodes except for the first reference electrode 141 may be blocked. The reason is that the secondary battery 100 is more likely to be in the EOL state while the first impedance is less than the first reference value, so that unnecessary computation is prevented.
- the first reference value may be a predetermined value through a preliminary experiment.
- the controller 230 may additionally output an electrode selection signal for commanding one of the remaining reference electrodes in addition to the first reference electrode 141.
- the controller 230 outputs an electrode selection signal for designating the second reference electrode 142, so that the first connection point P1 and the second connection point are before and after a time when the first impedance is measured by the impedance measuring unit 220.
- the second impedance between the reference electrodes 142 may be controlled to be measured.
- the controller 230 may determine the secondary battery based on the measured impedance. The remaining life of 100 can be predicted.
- the controller 230 may predict the remaining life of the secondary battery 100 based on the first impedance and the second impedance measured within a predetermined time range. Preferably, the controller 230 may predict the remaining life of the secondary battery 100 based on the ratio of the first impedance to the second impedance.
- the controller 230 may decrease the predicted value of the remaining life of the secondary battery 100 as the ratio of the first impedance to the second impedance increases. This is because, as the secondary battery 100 degenerates due to the heat generation of the electrode tab 130, the specific resistance of the region relatively close to the electrode tab 130 increases more than the specific resistance of the relatively distant region.
- the controller 230 may output an electrode selection signal for designating the selection of the third reference electrode 143. Accordingly, the electrode selector 210 may select the first to third reference electrodes 143 according to a predetermined rule.
- the controller 230 may further determine the secondary battery 100 based on the third impedance.
- the remaining life can be predicted.
- the ratio of the first impedance to the second impedance is greater than or equal to the second reference value, it is not necessary to replace the secondary battery 100, but a risk that the remaining life of the secondary battery may abruptly decrease due to heat generation of the electrode tab 130. It may mean that you are in a state. Accordingly, the third impedance corresponding to the first impedance and the second impedance may be additionally used to prepare for a sharp drop in the predicted value of the remaining life of the secondary battery 100.
- the controller 230 If the ratio of the first impedance to the second impedance is greater than or equal to the third reference value (eg, 0.9) that is greater than the second reference value, the controller 230 outputs an alarm signal notifying that the secondary battery 100 needs to be replaced. can do.
- the alarm signal output from the controller 230 may be converted into a form that can be recognized by the user through the information guide unit.
- the second and third reference values may be predetermined values through preliminary experiments similar to the first reference values.
- impedance spectra of the first reference electrode 141 and the second reference electrode 142 may be checked.
- the impedance spectrum of the first reference electrode 141 is such that the alternating current applied to the positive electrode tab 131 is changed within a predetermined frequency band while the first reference electrode 141 is selected by the electrode selector 210.
- the measurement results are shown.
- the impedance spectrum of the second reference electrode 142 is such that the alternating current applied to the positive electrode tab 131 is changed within a predetermined frequency band while the second reference electrode 142 is selected by the electrode selector 210.
- the measurement results are shown.
- the first impedance is RS1 which is a value of the real component of the composite impedance measured at a specific frequency (eg, 1 kHz) within the predetermined frequency band
- the second impedance is the real component of the composite impedance measured at the specific frequency.
- the value may be RS2.
- the controller 230 may monitor the degree of nonuniform degeneration of each of the secondary batteries 100 based on the ratio of RS1 to RS2 to predict the remaining life of the secondary battery 100 or notify the user. .
- the third impedance is a real component of the comprehensive impedance measured at the specific frequency while the third reference electrode 143 is selected by the electrode selector 210 similarly to the first impedance and the second impedance. It may be a value of.
- the life prediction apparatus 200 changes an alternating current applied to the negative electrode tab 132 within a predetermined frequency band, and the area between the second connection point P2 and each reference position M1, M2, M3. You can also measure the star impedance spectrum.
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Abstract
La présente invention concerne une batterie rechargeable et un dispositif de prédiction de durée de vie associé, et l'objectif du dispositif de prédiction de durée de vie selon un mode de réalisation de la présente invention est de prédire la durée de vie de la batterie rechargeable comprenant un ensemble d'électrode, une patte de cathode, une patte d'anode, un boîtier et une pluralité d'électrodes de référence. En particulier, le dispositif de prédiction de durée de vie prédit la durée de vie restante de la batterie rechargeable par détection d'impédances pour des régions de différentes plages de la batterie rechargeable au moyen de la pluralité d'électrodes de référence.
Priority Applications (3)
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US16/078,799 US10969438B2 (en) | 2016-10-25 | 2017-09-28 | Secondary battery and life prediction apparatus thereof |
EP17863755.9A EP3413387B1 (fr) | 2016-10-25 | 2017-09-28 | Batterie rechargeable et dispositif de prédiction de durée de vie associé |
CN201780016418.3A CN108886163B (zh) | 2016-10-25 | 2017-09-28 | 二次电池及其寿命预测装置 |
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KR1020160139389A KR102038611B1 (ko) | 2016-10-25 | 2016-10-25 | 이차 전지 및 그것의 수명 예측 장치 |
KR10-2016-0139389 | 2016-10-25 |
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PCT/KR2017/010882 WO2018080043A1 (fr) | 2016-10-25 | 2017-09-28 | Batterie rechargeable et dispositif de prédiction de durée de vie associé |
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US (1) | US10969438B2 (fr) |
EP (1) | EP3413387B1 (fr) |
KR (1) | KR102038611B1 (fr) |
CN (1) | CN108886163B (fr) |
WO (1) | WO2018080043A1 (fr) |
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DE102019108921A1 (de) * | 2019-04-04 | 2020-10-08 | Bayerische Motoren Werke Aktiengesellschaft | Zweiteilige Referenzelektrode |
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CN113140820B (zh) * | 2021-03-22 | 2022-11-18 | 同济大学 | 一种精确测量用三电极扣式电池装置及应用 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110873844A (zh) * | 2018-08-30 | 2020-03-10 | 丰田自动车株式会社 | 二次电池的劣化状态推定方法以及二次电池系统 |
CN110873844B (zh) * | 2018-08-30 | 2021-08-31 | 丰田自动车株式会社 | 二次电池的劣化状态推定方法以及二次电池系统 |
CN110109028A (zh) * | 2019-04-12 | 2019-08-09 | 江苏大学 | 一种动力电池剩余寿命间接预测方法 |
CN113178612A (zh) * | 2021-04-27 | 2021-07-27 | Oppo广东移动通信有限公司 | 电池组件及其控制方法和电子设备 |
CN113178612B (zh) * | 2021-04-27 | 2023-12-15 | Oppo广东移动通信有限公司 | 电池组件及其控制方法和电子设备 |
Also Published As
Publication number | Publication date |
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EP3413387B1 (fr) | 2019-12-04 |
KR102038611B1 (ko) | 2019-10-30 |
KR20180045374A (ko) | 2018-05-04 |
CN108886163B (zh) | 2021-04-16 |
US20190064275A1 (en) | 2019-02-28 |
EP3413387A1 (fr) | 2018-12-12 |
US10969438B2 (en) | 2021-04-06 |
EP3413387A4 (fr) | 2019-05-08 |
CN108886163A (zh) | 2018-11-23 |
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